... Tong Jinghai County of Tianjin Industrial Park Daqiuzhuang territory, is a professional production of square tubes, rectangular tube, galvanized square ... production level, all with computer control of production, with a high-frequency welding cold forming technology, direct prescription cold-formed ... 85*85 90*90 95*95 98*98 100*100 105*105 110*110 115*115 120*120 125*125 130*130135*135 140*140 145*145 ...